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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb70c29b543a8edefb41600bcabd6259099b70e484cc247e3ac32a976233f29' 
  AND token = 'cHzi/BsGib/tXdJ0G48fwqgEdTCHZNcCOf6zHdEyFq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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