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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b4c40e20918e2fb68a17a467f9d0ac5d43faca15147c1453725f1db8b7d7c' 
  AND token = 'bpgAR4TXf2ZyGXkr+2ZHsTg1kIpfcL1bIRQCLKJS8eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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