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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ceb618101de9fa0ee2a774c02a480621ab519e6c46975a1d6c5c19cc7220bb5' 
  AND token = 'dmbSZFU5GUukPxDd0UUiIuy+4oOhttEnxYAbvW78dd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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