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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afae0e0a7bf0abbd8e94658ce75e22d2bd92f9823b9e2c510db56b37026771a' 
  AND token = '3265OB3rMK2zsggyCdCbTdxTm2ZT04AKNxlz5vd3KfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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