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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e8adf590cafddf46907074d6f4d46a730bdc0c763bc70694a98cbb6654856d' 
  AND token = 'xYe1+dGP4DBoMfbwhZy4UnbddD1872ox6aX9rM59qVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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