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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664d14f4dc5623fadb4a90d76f60b8494bcd9149fafb2baf93991a7d7d1f278e' 
  AND token = '2sceu43S0YxMKCJzym4xR3g4t8sSPZmyykLypCiX/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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