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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e866cc55ddb5923a6baa57a13d5abc7a4f82dd157d24922148f951e505d68e' 
  AND token = 'LnmvEXWmPOdJ9QAM8us3jZTyr5j6yzYBVy9RIgwWEuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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