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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2617948f9a467a5c7ac47911070a3f6dba31a43f5376e0f8d71284d633b6c9c1' 
  AND token = 'pNDKn1nySW63VinCz2JZB1CL8tcUQoDl1x81x59CUAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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