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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896beb711d9c44898f85fa0134b625f6c0b7c136c07a03c50a9c9756805ed270' 
  AND token = '2m9qwznrF3G1cbOAVxBr940PA6ovafLU83gTBFQq+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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