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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a31c0538199fbbe822c1bf9cd45fd4f707e190f5449e6110ffea89055aaf1a3' 
  AND token = 'ZCM//O5cznGD6OJNjs9bbn1iG96dsSdD2V/fD+aul1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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