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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45636ec93fb6d9192f52c9a0d16211efc5b50c16b66eb21ef5ec808c5894758' 
  AND token = 'xERK18QNqUoCNw8q0q/p9C7eJR4cBBiRbJiXkTKZ0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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