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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12c558f7b53c8f64b34f41e966ce26d0846875a28e1c32209b77607834e4e85' 
  AND token = 'WP4X3lsGEKAOSylV1xtXTr1Nqmy2YbBvafbuFO9KviA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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