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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bcfdf81312fe6d1c18345d8767692ea33d31974102ad4a0d1103823420c6f8' 
  AND token = 'bcIZAl8WIXCFzL9f/ypdCTo/eSCJ0cC9IT9G/Mnw6LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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