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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9572c8f892d9f7cc3037304529a1a1c3e8d9fef547e893da43abbbe7bf605cdf' 
  AND token = 'Km4ZVN+uY2rLV4KUs04weDMhx9x/tt5ZeFkw4F0FqNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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