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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d87b9c7588411ce1aea3e52df5512d8680191d8e7ed6ea6c250d66cc6599cb8' 
  AND token = '4fjrqR80JHJU4ww2+WYFF3ORyT8bRTDS2xbRCczTjEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}