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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232ff6c44444617e722139ae0cfe87e9435fbab8a665db9d5d61f2a8b520a1db' 
  AND token = 'Ej8gJQbQYacfyyAIwh0PaU+HPl5ztZ6WFaXOY5yhtcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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