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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae04a4dea279641d8ddc300647c6001bb8a33be259b50cc883d83b1a056f8987' 
  AND token = '1rB1Fr9GdGKESaVOjQddC51/QoDp+21czsiDMi98ZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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