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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e4dadbaf6abed3d4bbaaaafbe03b6d97811406aac309b4a2b590c030649d10' 
  AND token = 'uyl7vNTph1MPbQjdKK4e0Gm2/zcQrsdFxSeF93XL/O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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