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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2407c62c0fa4656a3feffbda1659f45383e2f78277903fa6a204d32406be6dd9' 
  AND token = 'cMibm2gEEWzCV47rrTK55JH8QjYe0FR+5byuprMTVl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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