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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbf31fb3f09ee40f8c52b607b19046f3b03913b5312a42fde50120f97be9045' 
  AND token = 'L4b9cTm7nMBbESABg6if+tWZWG5VX/MvYFeDemHIRtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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