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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf6131bff5e300c38bc42ec2aa7c8f93ae4d362847295bbfa75e7857a164b7d' 
  AND token = 'TyG4NS+HXU29ZMWJxxYyNkbsfqVYVchy95BWo3M2K3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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