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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec11879dd46017544d0c2d41d3867606a16c772048eb8611e3a0a327ae10cd9' 
  AND token = 'PBHPbym2b7j8ShoDlT51wCdAChRbP7VueyQV/oFKhYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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