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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4adb3be1f3ec904d7a28dc96a819548ad39291b23d97c6059d575e70c1fbf5' 
  AND token = 'm2qj42rw8Oy6bABpBVEJlINolyGstpnHdqiIfGwCEro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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