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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56463f22690079567c61866f14245e30500e9e1f3efc26998a64b4d2730e668f' 
  AND token = '9+lzkUJx30asqxnJPypbjH46VAeC/MMMHawjw7djfTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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