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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c753ee1ea932c9ea4b69d6c3a5812d511f481f6b7c0a1cea0acda3b41a1187f' 
  AND token = 'Bgm0F/c7neMnxb917JbL7eM4vOCHHj4OE9z3BYPX5Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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