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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ec8f1ad7c443b1ca9487f12ad6ec439f80e1482fa775c54e60046a5a9a8188' 
  AND token = 'sRG5GS9szzEUuCbmW9L24Uso9Efcxcfrr6P6Osr0Y/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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