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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecf65e6b4735947732f1cc6a3b7964dbb6a5bfdffcef47c98ed9a726e1844e1' 
  AND token = 'BwdN9aRLJfUb+4Tm/S22rV2+5nvV1rvZc5rZDbHeSZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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