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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d07abda7cb20148c9893c615d5e2f8495a3b987b139fee2f1a5f1cf12c7adf' 
  AND token = 'u/Ejz5M5uGtN2Nk8rAL/hgIE+Es1dHrsanEBPUuwI0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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