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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c0910d433b73596076e8775093288f27b24befa4671c70e8be6514902008e5' 
  AND token = 'dNNZQQA/yyuDz5XsE4v4LbbkFG1fz5lzDn7iFw9yxZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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