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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb6df5b91098698245b7fc7a4abe5bb21c4e776556bb1d922fe4e3937c4974d' 
  AND token = 'dac0r9stoPDBXsHa6sOgm5rtm+O2HQBuYXtWolKoFG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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