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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6264df5573f96afe64c66631e542604c984bb15d8a1930d68cc257d357aaf2' 
  AND token = '6aU9iJi2lTTI2BsDF4utakizj5BN6Ha+Lq8xwz8ARaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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