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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c065c1c46d1eb4f4298a129567e82d9e54d5753a32ccff348625607d45465b3' 
  AND token = '1cZmwbgeSPSuSBODSrpCjLHLK7Wo2S4Jg5RCXVbg474=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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