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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3969b157bddb02ae9c7da7ac661722017ebf0b6cc30d17ac595c4a9a6d8d0d06' 
  AND token = 'XFzuqFpBd0/CFqSw6tZ1zdT6XxCXsorSL/+Nu3rq34Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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