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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0ad825f80b350944d6337ffa62d2947e14ddc2f60d9c2732f885498205b9bd' 
  AND token = 'a/vVE+OzvcvsX7+k1HiRvn9UveVldMdxCXk0ToqJSQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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