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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4518a857c9bf5d3952dfaa8cb9ffdb50da11e7ebaec6da98e92a9c817c6818f' 
  AND token = 'pOlK3UwYZ7kUhXx5PrDOMP9/+IFzMshi/5XYk0zb4VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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