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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969d7fc77eb9692edcf076fd0fc4f2dbd179e87a28e4d626d2dfe88173bd61e9' 
  AND token = 'sEAV30z2nCNZvd02mFwiqt65b733S/8EF2sc4ktSOMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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