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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b89e5fbab4371b1f7ebbd93266aba7bee331a4c3e5cff906697090e8e113f86' 
  AND token = 'KaygXmaI01RtkRlPXbzTDzyw/Rk2W+okf+qkWn05iyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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