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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3985a5538df584604ec23f7623a472842cc0ee3160c18838c1467e0b1db1b2aa' 
  AND token = 'FBGMyYF4PAin1DCMnssEUzmwgSPb3RgM6RvqjnYBlCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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