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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feee5757cdd0505872d92d3e9617cc30f21fb7db963b1a0fbeb2595f11fbaf82' 
  AND token = 'lM9iGeXlorOveLxArhIvfA4Rr11LIFy2oK3dkLPicik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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