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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf95f24c8001ae8ddc4dc5b1bef60b80cc9040e02ab6d7ebf9ff37fc687bcb82' 
  AND token = 'Fx8NOleNDdVBL93pHbnunDBZ+n+PlETM3wQWq+cMfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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