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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bc14d153b0c3442f37dda7cd477b2f4e67abd28f4a1a3f26dcb61502ea7547' 
  AND token = 'mQkJcIsyTOvqJPPLqEotTm50YufqJi3YOnXU0LhQ1oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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