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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e725cc83997ec1f58e3cb1f67fca1409d519a01cbee7b7b6e9c2eeaa26f213c' 
  AND token = 'c5eq9ZJEUwBvzdm5tjCpI+H2Z4X+EFbZ3UhBWHt9EKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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