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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf880ce15f1c21356907946205723c1f52001aa184a544a88524b9065795f387' 
  AND token = 'omgc0+Zj+1E0w/IsE6crUzkmUw/chosxQZr+IIP64po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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