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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae560d1899db022c435b5197ce56d6d5f9b3bdb9bcd1637804653f2c0629448' 
  AND token = 'Pd4zbkLulWbmgwcrgm7wBP319jmk6vt6dD+RfTEjA+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00232

JSON explain

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