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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5519825e85934caeb45dcbea2fade84d9b53d8e86805e6a4c8bb35522ac24a37' 
  AND token = '1jRBps+s3evujrShgSkWv0QVmUQCP0aaU9fF8Jznmuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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