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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179839b2f51e80e50761342abd03ee7bbe1d1ffa32d4cba6584ac5a874b626a5' 
  AND token = '8HEK4lbdRzLxG55pD+VgQiWim44AVMW1KMv9ykGOivI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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