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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6700812e2eb94e372d827cd243f198052cffde99a926f1ec578d5103ac501418' 
  AND token = '03aA+oH17iSUabStzHnJInBJTeR/tIZ2FJmeMQQRF3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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