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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012ce5b955b203a0902c18c8706cb888fb03622d0607b2bf61388d36e3d83fcc' 
  AND token = 'TQj6yYRHGeEr0TqC8nRWAmp15QPvJTDlnD7wWazzUv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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