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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58e4035ef776aef434a9a3c3160be633334f8e08ac8df0170bd2b2f6f43f3be' 
  AND token = 'zrxLYm4U1kZ8Rxz2NkE3mwjK+y/mQIFUetHk8FQZCr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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