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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973730c1477e1a077ec88243116151a3f4fd50627f1e4dee3817ded9743b58f5' 
  AND token = '/YW/VmFSOvyime+JLYOclnkWfDqjaLEthM6rgiELEI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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