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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a883c72e6168c313be36a3d4512a614ef84a01c13836a0492f917e4f31ee9f92' 
  AND token = 'DLZVc4q7emP+amA8Cj8C92FTmiMNbHZKUI6WvX0kSSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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