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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692c5576877946e919bd2daf07f38536e4af69af54b6e73556f175191e5a8f81' 
  AND token = 'V8wjlTlIueEig2CIBbPtTbJVP9f3eaRLMzBYvFtT56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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