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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaf2624cc4ddf88e8e1bbe2db1ee4ac36ac8324d418527f442aaed1f612873d' 
  AND token = 'BdI/SpzYp1nmEqWOYaQtSVBYwieRg4340K7vp7td438=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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