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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566c07a0bfd3e3cf85d113db4ca0883f2c7c3d017c9412ec80b3fd414a5b33f0' 
  AND token = 'p1Vn7WUHFlwO9UPqesrcwuJxA7eCGSdrkLzz59dqSNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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