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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17962f35c583c69a740907ff9c4e987b235932f95062325412584df738db6e64' 
  AND token = 'lyVo0lHH+pNjPlcyyIBupQy/4PVCFk3li2fvkYWWC58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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