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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7657f3a354efbeadca0edc5647625d69cea042ef8c45946106fab88468168d20' 
  AND token = 'z/PhRJ8LmHsq2iQZmCfnZZK9Soh4QvuSMWDrkvLoyd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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