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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef02caa1bab6ed1f4127ac06c2389e7d1de08f10c28eff25f8e3960c2b2be5b' 
  AND token = 'CGmN0NNdi6jUiRePZ/Dpty3Z+tmP+34M5bXDBZxW8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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