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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9236a908eca21b997edb2ba228e5388345ce54c2e64429a6205ee2e68e54f7dd' 
  AND token = '4Ic77HR1VjCfXGBC3I8+BB1rocXpHk+6mq/2WxyxyV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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