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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cda8e370ca31942f13a245b068d0a0b427555822cfa564002652cdf00823e12' 
  AND token = '/GkxaYva6rGKVbIgkDYYIgfh5A5MY+1HHtEz8Duz6/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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