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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394290961d7ca43859bf0bd3966f499432a9971a6aee467e7c9b84d0347d95aa' 
  AND token = '5gs4ZIIelR7i2E5AHP1LIzbBoYWOPZ4TRHhouCh2iLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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