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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b59eaa807dcccd88e286a6a660c95c1277b48fd8b510ff0991842b72096f2c' 
  AND token = 'ZQG9Pt79ASEVOycH4oRzf3WsRPMw+Cd6Ek/OSFeKg50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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