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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e386c57eba6db24f69672566d3b4f21116aab0aa29447eea54a6796ee70841f' 
  AND token = 'A/pITj9I1xMdDQTiYH17gafz97Zz1RUy6jAK8UALIEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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