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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba7a560cd4a74ab6c2044ec4a4838f827e9e333c79e9d782168038eceab72f1' 
  AND token = 'Srp81l2lMoLLgFaMn5OZPN97EpezNTC6EORHbQ9YbeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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