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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6002c941b3b946e6680ddeb71577f2236c5826bfdb175c9c7dfa67b81fa7ffcc' 
  AND token = 'MoKkuOoUlMzb9RrSuXtqwte0w1qLYs730qLA1Chczmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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