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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83caff1900a0e09a4a90ea231ce2fe7bc0a797f493d4d3c36f23270ffabbd9d5' 
  AND token = 'quZuizcmFjKDu36f1yHpdNV0u+SeIh4u4PS4j9wKkMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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