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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592ba8202848fb31fd626c6e4a8a48a4c4cda78d59b7a7044e86cfb1f8945604' 
  AND token = 'kdxqVbk76/xRDvfD1yqPL+feiywdl598jTM81IJ0EtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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