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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666883a8b8bb5aac9c341e63f303dffc589bb01b14786ef4fb56c4b2538ed098' 
  AND token = 'pti8yxUlUTazDty7J8BcxQTIWgdnnsW53oO4BMFIo+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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