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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb313de901e2929e3383173a56aed4585483697a2ec6a5bca2d103925ee82260' 
  AND token = 'PCPXT7iDme5Vj9IuQQUS2+7E8tPgtLn0Dh1W1inGvug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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