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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e8064fe806d961f9945340cf8f39e2ca0613c5ac665f96e248a45dede0534c' 
  AND token = '5WTSekLWFMAWL56lNbE3lFLLN0frOq8HMcgNYWUkprs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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