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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc341385781c4c418ce172a7f800f72e27ebdf8d274b0f13b6072612f9620bc' 
  AND token = 'pADhq07Eq8jUjhO/iERnZWk90qgSpMaGDcS5BHGUIXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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