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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39592fa213c9cb43ce9b3b29b54ce3d0d6aa707a8049b1e265918d425beaafbb' 
  AND token = 'WO2sn2saFaDXdd3KF2uJtWJS0DX9N2HjtFe4OR6vSuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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