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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011451d90715d900c9d145c46ace6447c87cb7465abed0405dc86005dc35d8dd' 
  AND token = 'MtqrnqE60vdO2kmGEjoZVc7PCc3bFgdTqrJBkSmgjPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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