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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15d7e9e3827fe5ad73d405d8088595ad35c85672fff8d0627ecde8e02a13882' 
  AND token = 'R2ftBVkY4N1HXJ7yAXBdJnquX9zwirOdYLrxjB6lCeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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